Transmission gearing



June 26, 1928.

G. C. CARHART TRANSMISSION GEARING Filed Aug.l4, 1923 I XVENTOR.

..' TTORNEYS,

Patented June 26, 19 28,; g I UNITED STAT/ES PATENT OFFICE.

oaoaoa c. oammar, or sraaousa, new roax, assrouoa TO renown-Lira oaaa COMPANY, or SYRAQUSE, NEW max, A ,coaroaarrou on NEW Yoax.

TRANSMISSION GEARING.

Application filed August 14, 1923. Serial No. 657,409.

1 This invention relates to transmission shaft 1. The driving shaft 1 is, also, progearings, such as are used in motor vehicles vided with gear 12 which meshes with gear and more particularly to such a transmission 13 on countershafh The gear 5 is shiftable gearing having a clutch member which is 1n one direction from neutral to engage the 5 shiftable into and out of engaging position clutch faces 10, and 11 to roduce direct to disengage the propeller shaft of the vedrive or high s eed'and is slliftable in the hide from the driven shaft of the gearing other direction rom neutral into mesh with while the gears are being shifted and has for the gear 7 to produce second speed. The .its object a particularly simple, efficient and gear 6 is shiftable in one direction from neu- 10 durable means for shifting the clutch section tral into mesh with the gear 8 to produce low as during or preliminary and subconsequent to speed in the other direction into engagement each gear shifting operation. with the idler not shown to produce reverse The invention consists in the novel feaspeed. tures and in the combinations and the con- Means for selecting and shifting gears 5,

structions hereinafter set forthand claimed. 6 Comprises a lever suitably supported in the -'In describing this invention. reference is cover 14 of the case 3 and having transverse had to the accompanying drawings in which I movements to select'either one of two parts like characters designate theTcorresponding ndividualto the gears 5, 6 and a movement parts i ll th i w in another direction to shift such parts.

2 Figure 1 is a side elevation, partly broken Such parts are here shown having a pair of 7 away, of a transmission gearing embodyrods 15, 16 shiftable endwisely in the case in i my i tio p a direction parallel to the shaft 2 and carry- I Fi 2 i a transverse gtio al i ing forks 17, 18 coacting with the gears 5, 6 t k th plane f 1i 2 2, Fi 1, respectlvely, these rods having extensions -25 Thi transmission gearing comprises gen- 19, 20 at one end extending to the outside of erally a plurality of peed elements main (38.86 and provided Cam SUI- such as the usual shiftable gears and clutch, faces means for shifting said elements including 23 and 24 designate the members of a, parts individual to the shiftable elements or c h. w oh a e no mally engaged, and one gears, an operating memb rfmov ble to eof which is s'hiftable out of and into engagelect and shift either one of; said parts, a. {nent with the other during each gear shiftclut-ch including a shiftable member shiftg peration. The member 24 is here shown able out of and into engaging position dur as fixed on the driven shaft 2, and the moming each gear shifting operation and means ber 23 as mounted upon an extension 26 of operated by said parts for shifting or onthe driven shaft. This extension 26 has a trolling the shifting of the clutch member. pllot at 27 in the driven shaft in one end and Th t i i i as h h is 1ournalled at its other end in bearings 28 comprises driving and driven shafts 1, 2 p by a 9 mg attached to a W ll journalled in the case 3 in axial alinement, a of the mam CHSlHg In any suitable manner,

- countershaft 4, also, journalled in the case 3, as y bolts Screws- The extensions speed changing elements for gears and clutch 19 and 20 of the 'Q 16 extend thmugh sections mounted on the shafts some of such the Wall of the m case 3 and into the 11pelements being shiftable and means for shift- P P r of the Case Th ex ensi n 26 0f i g id hift bl l m t Th speed the driven shaft is connected at its outer or changing elements as here hown, include rear end to propeller Sllflft Of the Vehicle, shift-able gears 5, 6 mounted on the driven and 15 here shownfis havlng a p ng shaft 2 to rotate therewith and shift axially 30 as 9 section of a universal J thereof into and out of engagement with Also, suitable gearing for driving a-speedgears 7 and 8 m the countershaft and into ometer iS actuated by the extension 26, this engagement with an idler gear, not shown. g r g b ing here Shown as a worm 31 meshing with a gear 9 on the countershaft. mounted on the extension 26, and a worm The gear 5. alsohhas a clutch face 10 shiftgear 32 meshing with the worm and mounted able therewith into and out of engagement on the shaft 33 which is coupled in any suitwith the clutch face 11 associated with or able manner as by a flexible shaft, to the fixed on the opposing end of the driving speedometer. m

The clutch member 23 is shiftable axially of the extension 26 into and out of engagement with the clutch member 24, and the members 24 and 23 are provided with coacting clutch teeth. The clutch member 23 may be of any suitable form, size and construction and is here shown as composed of outer and inner sections 34 and 35, having frictionally engaged conical faces 36 and means for holding the sections with such faces frictionally engaged.

This means is here shown as springs, one of which is shown at 37, each spring located in a recess 38 in the inner section and abuts at one end a ainst the bottom of the recess and at its ot er end against an abutment ring 40, having shoulders or pins 41 at intervals arranged in recesses 42, similar to the recesses 38 in the inner clutch section, the pins or shoulders 41 alternating with the springs 37. The abutment ring is held in position and also adjustable to adjust the tension of the springs, by a collar 43 having an angular flange 44 threading on the outer section of the clutch member 23. The teeth or jaws 45 on the outer section are longer than the teeth of the jaws 46 on the inner section in order to engage the teeth 47 of the member 24 in advanceof the teeth 46 of the inner section. This construction of sectional clutch member tends to nchronize the rotative movements of the c utch members and the shafts on which they are mounted, during the shifting of the member 23 intoengagement with the member 24. However in so far as this invention is concerned the clutch members may be of any suitable form, size and construction. 7 Y

The means for shifting the clutch member 23 out of engagement with the clutch member 24, prior to the gear shifting operation and for shifting it back into engagement with the clutch member 24, after the gear shifting operation, is controlled in its actuation by the shifting rods 15 and 16; and as here shown, comprises a motion transmitting member, as a lever 49 pivoted at- 50 to the case 29 and usually extending between the extensions 19; 20 of the rods 15. 16, this lever being preferably angular, and one arm thereof having a fork 51, coacting with a groove 52 in the hub of the shiftable clutch member 23. and the other arm thereof hav ing means forcoacting with the cam surfaces. 21, 22, of the extensions 19, 20, of the rods 15, 16. This means comprises a lever 53 pivoted at 54 to the arm 55 of the lever 49 on an axis extending lengthwise of such arm or parallel to the rods 15, 16, so that the lever extends transversely of the arm 55, the lever 53 being shown as mounted upon a stud, at, g the rearward end of the arm 55 and as h8.V.'

ing followers as rollers 57, 58 on opposite sides of its pivot. which coact with the cam surfaces 21, 22. The lever 49 is actuated in and 58 are engaged withthe high points 0 the cam surfaces 21 and 22, and the clutch member 24 is out of engaging position, as shown in Figure 1. When either rod 19 or 20 is shifted in one direction or the other from neutral, as for instance the rod 20, the i roller 58 coacts with the cam surface 22 and rides down one of the inclines of the cam 22, and the lever 53 moves downwardly about a fulcrum point located at the oint of contact of the other roller 57 and th e high point of the cam 21, so that, the lever arm '55 moves 1 downwardly and in so doing shifts the clutch member 23 into engagement with the clutch member 24. j

The downward movement of the lever arm '55 is effected by a spring 59 which yieldingly shifts the clutchmember 23 into engagement with the clutch member "24. This spring 59 is here-shown as located in a cap or thim ble 60, suitably mounted in the cover 61 for a case 29.'the spring 59 thrusting at one end against the top or cap of the thimble, and at its other (and against a shoulder 63 pivoted on a pin 64, movable endwisely through the cap and the top wall thereof, the pin 64having its lower end acting on the arm 55 of the lever 49,'the lower end of the pin 64 as here shown thrusting against the immediate part of the lever53 directly above the pivot thereof or thrusting against the lever 53 substantially in line with the lever arm 55. The cam surfaces 21 and 22 positively act on the lever 49, this action shifting the clutch member 23 out of engagement with the member 24,-and the spring 59 yieldingly forces the clutch member 23 into en-' gaging position. Owing to the lever 53 movement of either rod 15, or 16 is transferred to the shiftable" clutch 1 member member or lever 49. WhatIclaim is:

l1. In a transmission gearing, the combine:

and means for shifting said elements, com-- tion with shiftable speed changing elements,

prising parts individual to said elements,

said parts being formed with cam surfaces,

iiao

versely of said-parts, the lever having followers on opposite sides of its axis coacting with the cam surfaces of said parts, whereby movement of one of said parts tilts said lever I no through the single motion, transmitting about the point of engagement of the other of said parts and the follower engaged therewith.

2. In a transmission gearing, the combination with shiftable speed changing elements, and means for shifting said elements, comprising parts individual to said elements, said parts being formed with cam surfaces, of a clutch member shiftable out of and into engaging position during the shifting of each element, and means for shifting said member, comprising a motion transmitting member, a lever pivoted to the motion transmitting member on an axis extending trans: versely of the direction of the movement of the motion transmitting member, and transversely of said parts, the lever having followers on opposite sides of its axis coacting with the cam surfaces of said parts, whereby movement of one of said parts tilts said lever about the point of engagement of the other of said parts and the follower coacting therewith, and the motion transmitting memher is actuated in one direction by the movement of such lever, and a spring acting to shift the motion transmitting part in the opposite direction.

3. In a transmission gearing, the combination with shiftable speed changing elements, and means for shifting said elements, comprising parts individual to said elements, said parts being formed with cam surfaces, of a clutch member shiftable out of and into engaging position during the shifting of each element, and means for shifting said member, comprising a motion transmitting member, a lever pivoted to the motion transmitting member on an axis extending transversely of the direction of the movement of the motion transmitting member, and transversely of said parts, the lever having followers on opposite sides of its axis coacting with the cam surfaces of said parts, whereby movement of one of said parts tilts said lever about the point of engagement of the other of said parts, and the follower coacting therewith, and the motion transmitting member is actuated in one direction by the movement of such lever, and a spring acting to shift the motion transmitting part in the opposite direction, said spring acting on the lever transversely of the axis of the lever.

4. The combination with a transmission gearing, comprising shiftab-le speed changing elements, and means for shifting said elements, including parts individual to said elements, said parts being formed with cam faces, of a clutch including a member shiftable out of and into engaging position during the shifting of each element, means for shifting said member, comprising a lever pivoted between its ends, one arm being connected to the clutch member, a second lever mounted on the other arm of the first lever and pivoted thereto on an axis extending in a direction lengthwise of such arm, and having followers on opposite sides of its axis coacting with the cam surfaces of said parts, and a spring to move the first lever in one direction and hold the followers engaged with said cam surfaces.

5. The combination of parts movable in substantially parallel directions, a shiftable member, motion transmitting means bet-ween said parts and said member whereby said member is shifted by the operation of either of said parts, said means comprising a lever having an arm extending substantially parallel to said parts, a second lever pivoted to said arm on an axis extending lengthwise of the arm and said parts, the second lever coacting on opposite sides of its axis with said parts.

In testimony whereof, I have hereunto signed m name, at Syracuse, in the county of Onon aga, and State of New York, this 13th day of Aug, 1923.

GEORGE C. CARHART. 

